CN105350008B - High-strength bolt dephosphorization technique - Google Patents
High-strength bolt dephosphorization technique Download PDFInfo
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- CN105350008B CN105350008B CN201510856589.XA CN201510856589A CN105350008B CN 105350008 B CN105350008 B CN 105350008B CN 201510856589 A CN201510856589 A CN 201510856589A CN 105350008 B CN105350008 B CN 105350008B
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- China
- Prior art keywords
- strength bolt
- powder
- alkaline solutions
- dephosphorization
- test solution
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
Abstract
The invention discloses high-strength bolt dephosphorization technique.If high-strength bolt is handled without dephosphorization before heat treatment, easily occurs phosphatizing phenomenon.Step of the present invention：KOH alkaline solutions are put into dephosphorization groove, take 25ml alkaline solutions using the free sub- alkali point content of sulfuric acid titration measurement；Cle cleaning and degreasing before bolt；Bolt and phosphorus alkali in groove solution reaction；Take high-strength bolt surface powder detection dephosphorization result；Mix the test solution phosphorus content after powder and be less than 0.1mg/L, then alkaline solution concentration is qualified, and dephosphorization is carried out to next bolt；Mix the test solution phosphorus content after powder and be higher than 0.1mg/L, then alkaline solution concentration is unqualified, readjusts concentration；Constantly regulate alkaline solution concentration, show that the free sub- alkali point content of 25ml alkaline solutions is less than 0.1mg/L for 13~23.5ml test solution phosphorus contents that can ensure to mix after powder.The present invention ensures that phosphate is removed totally bolt before heat treatment.
Description
Technical field
The invention belongs to automobile-used technical field of fastening, it is related to automobile-used bolt, and in particular to a kind of high-strength bolt dephosphorization
Technique.
Background technology
Raw material are anti-corrosion, and phosphate treated can be all carried out on surface, when for high-strength bolt, if before heat treatment not
Carry out dephosphorization processing, it is easy to occur the phenomenon of phosphatizing, and cause bolt fracture.And the degree of phosphorus ligands will badly influence production
Quality.
The content of the invention
The purpose of the present invention is the surface phosphatizing phenomenon occurred for high-strength bolt in heat treatment process, is proposed a kind of
High-strength bolt dephosphorization technique.
The present invention's comprises the following steps that：
KOH alkaline solutions, and the method for taking the 25ml KOH alkaline solutions to use sulfuric acid to titrate are put into step 1, dephosphorization groove
Measure the content of free sub- alkali point.
Step 2, to high-strength bolt carry out before Cle cleaning and degreasing.Before clean for using clear water rinse high-strength bolt.Make
Degreasing is carried out to high-strength bolt with hot water, water temperature is more than or equal to 70 DEG C, and degreasing time is more than or equal to 8s.
Step 3, the high-strength bolt after step 2 processing are positioned in dephosphorization groove, with the KOH alkaline solutions in dephosphorization groove
React, peel off the phosphate on high-strength bolt surface.
Step 4, different high-strength bolts dephosphorization result in the KOH alkaline solutions of various concentrations are different, it is therefore desirable to enter
Row dephosphorization result is detected, specific as follows：
1. the remaining grease and KOH on the high-strength bolt surface after being handled through step 3 are washed away with alcohol or acetone
Alkaline solution Liquid Residue；
2. high-strength bolt is dried up with hair-dryer；
3. the powder that high-strength bolt surface is scraped with blade is well mixed with testing solution, and the weight of powder takes 0.4~
Any value in 0.6g, but the powder taken every time is equal in weight.
4. colorimetric detection is carried out to the test solution phosphorus content after mixing powder.
If the test solution phosphorus content after powder is mixed in step 5, step 4 is less than 0.1mg/L, judge that KOH alkalescence is molten
The corresponding concentration of liquid is qualified, and step 2~4 are carried out to next high-strength bolt；If mixing the test solution after powder in step 4
Phosphorus content is higher than 0.1mg/L, then judges that the corresponding concentration of KOH alkaline solutions is unqualified, readjust the dense of KOH alkaline solutions
Degree, and the method for taking 25mlKOH alkaline solutions to be titrated using sulfuric acid out of dephosphorization groove measures the content of free sub- alkali point.
Step 6, the concentration by constantly regulate alkaline solution, draw the side that 25mlKOH alkaline solutions use sulfuric acid to titrate
Method measures the content of free sub- alkali point to ensure to mix the test solution phosphorus content after powder in the range of 13~23.5ml
Concentration less than 0.1mg/L, namely KOH alkaline solutions is that can ensure that the test mixed after powder is molten in the range of 100~180g/L
Liquid phosphorus content is less than 0.1mg/L.
The device have the advantages that：
The phosphate on bolt surface is removed by chemical method, it is ensured that phosphate removal is dry before heat treatment for bolt
Only.
Embodiment
The present invention is described in detail with reference to embodiment.
High-strength bolt dephosphorization technique, is comprised the following steps that：
KOH alkaline solutions, and the method for taking the 25ml KOH alkaline solutions to use sulfuric acid to titrate are put into step 1, dephosphorization groove
Measure the content of free sub- alkali point.
Step 2, to high-strength bolt carry out before Cle cleaning and degreasing.Before clean for using clear water rinse high-strength bolt.Make
Degreasing is carried out to high-strength bolt with hot water, water temperature is more than or equal to 70 DEG C, and degreasing time is more than or equal to 8s.
Step 3, the high-strength bolt after step 2 processing are positioned in dephosphorization groove, with the KOH alkaline solutions in dephosphorization groove
React, peel off the phosphate on high-strength bolt surface.
Step 4, different high-strength bolts dephosphorization result in the KOH alkaline solutions of various concentrations are different, it is therefore desirable to enter
Row dephosphorization result is detected.
1. the remaining grease and KOH on the high-strength bolt surface after being handled through step 3 are washed away with alcohol or acetone
Alkaline solution Liquid Residue；
2. high-strength bolt is dried up with hair-dryer；
3. the powder that high-strength bolt surface is scraped with blade is well mixed with testing solution, and the weight of powder takes 0.4~
Any value in 0.6g, but the powder taken every time is equal in weight.
4. colorimetric detection is carried out to the test solution phosphorus content after mixing powder.
If the test solution phosphorus content after powder is mixed in step 5, step 4 is less than 0.1mg/L, judge that KOH alkalescence is molten
The corresponding concentration of liquid is qualified, and step 2~4 are carried out to next high-strength bolt；If mixing the test solution after powder in step 4
Phosphorus content is higher than 0.1mg/L, then judges that the corresponding concentration of KOH alkaline solutions is unqualified, readjust the dense of KOH alkaline solutions
Degree, and the method for taking 25mlKOH alkaline solutions to be titrated using sulfuric acid out of dephosphorization groove measures the content of free sub- alkali point.
Step 6, the concentration by constantly regulate alkaline solution, draw the side that 25mlKOH alkaline solutions use sulfuric acid to titrate
Method measures the content of free sub- alkali point to ensure to mix the test solution phosphorus content after powder in the range of 13~23.5ml
Concentration less than 0.1mg/L, namely KOH alkaline solutions is that can ensure that the test mixed after powder is molten in the range of 100~180g/L
Liquid phosphorus content is less than 0.1mg/L.
70 DEG C of extracting degreasing water temperature, degreasing time 8s, the weight 0.5g of powder, choose SnSO below4Solution is tested, it is right respectively
Concentration detects dephosphorization result for 100g/L, 150g/L and 180g/L KOH alkaline solutions.
Embodiment 1：
When the concentration of KOH alkaline solutions is 100g/L, 25ml is taken, is carried out with 1.5MOL/L sulfuric acid solution at titration
Reason, when phenolphthalein color is become colorless by red, calculate add sulfuric acid solution volume be 13ml, using the addition of sulfuric acid as
The quantity of free sub- alkali point is managed, and it is 0.05mg/L now to detect to mix the test solution phosphorus content after powder.
Embodiment 2：
When the concentration of KOH alkaline solutions is 150g/L, 25ml is taken, is carried out with 1.5MOL/L sulfuric acid solution at titration
Reason, when phenolphthalein color is become colorless by red, calculates and adds sulfuric acid solution volume 19.5ml, regard the addition of sulfuric acid as trip
The quantity of ion alkali point is managed, and it is 0.043mg/L now to detect to mix the test solution phosphorus content after powder.
Embodiment 3：
When the concentration of KOH alkaline solutions is 180g/L, 25ml is taken, is carried out with 1.5MOL/L sulfuric acid solution at titration
Reason, when phenolphthalein color is become colorless by red, calculates and adds sulfuric acid solution volume 23.5ml, regard the addition of sulfuric acid as trip
The quantity of ion alkali point is managed, and it is 0.03mg/L now to detect to mix the test solution phosphorus content after powder.
Claims (1)
1. high-strength bolt dephosphorization technique, it is characterised in that：The technique is specific as follows：
KOH alkaline solutions, and the method measurement for taking the 25ml KOH alkaline solutions to be titrated using sulfuric acid are put into step 1, dephosphorization groove
Go on a tour the content of ion alkali point；
Step 2, to high-strength bolt carry out before Cle cleaning and degreasing；Before clean for using clear water rinse high-strength bolt；Use heat
Water carries out degreasing to high-strength bolt, and water temperature is more than or equal to 70 DEG C, and degreasing time is more than or equal to 8s；
Step 3, the high-strength bolt after step 2 processing are positioned in dephosphorization groove, are occurred with the KOH alkaline solutions in dephosphorization groove
Reaction, peels off the phosphate on high-strength bolt surface；
Step 4, different high-strength bolts dephosphorization result in the KOH alkaline solutions of various concentrations are different, it is therefore desirable to gone
Phosphorus result is detected, specific as follows：
1. the remaining grease and KOH alkaline solutions on the high-strength bolt surface after being handled through step 3 are washed away with alcohol or acetone
Liquid Residue；
2. high-strength bolt is dried up with hair-dryer；
3. the powder that high-strength bolt surface is scraped with blade is well mixed with test solution, and the weight of powder takes 0.4~0.6g
In any value, but the powder taken every time is equal in weight；
4. colorimetric detection is carried out to the test solution phosphorus content after mixing powder；
If the test solution phosphorus content after powder is mixed in step 5, step 4 is less than 0.1mg/L, KOH alkaline solutions are judged
Corresponding concentration is qualified, and step 2~4 are carried out to next high-strength bolt；If mixing the test solution phosphorus after powder in step 4 to contain
Amount is higher than 0.1mg/L, then judges that the corresponding concentration of KOH alkaline solutions is unqualified, readjust the concentration of KOH alkaline solutions, and
The method for taking 25mlKOH alkaline solutions to be titrated using sulfuric acid out of dephosphorization groove measures the content of free sub- alkali point；
Step 6, the concentration by constantly regulate alkaline solution, show that the method that 25mlKOH alkaline solutions are titrated using sulfuric acid is surveyed
The content of free sub- alkali point is measured to ensure that the test solution phosphorus content mixed after powder is less than in the range of 13~23.5ml
0.1mg/L, namely the concentration of KOH alkaline solutions is that can ensure to mix the test solution phosphorus after powder in the range of 100~180g/L
Content is less than 0.1mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510856589.XA CN105350008B (en) | 2015-11-30 | 2015-11-30 | High-strength bolt dephosphorization technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510856589.XA CN105350008B (en) | 2015-11-30 | 2015-11-30 | High-strength bolt dephosphorization technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105350008A CN105350008A (en) | 2016-02-24 |
| CN105350008B true CN105350008B (en) | 2017-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510856589.XA Active CN105350008B (en) | 2015-11-30 | 2015-11-30 | High-strength bolt dephosphorization technique |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086362A (en) * | 2016-08-08 | 2016-11-09 | 常熟市常力紧固件有限公司 | A kind of Technology for Heating Processing of high hardness combination bolt |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426956A (en) * | 2006-04-25 | 2009-05-06 | 株式会社东乡制作所 | Anticorrosive metal part and process for producing the same |
| CN102409350A (en) * | 2010-09-26 | 2012-04-11 | 陈邱生 | Dephosphorizing equipment |
-
2015
- 2015-11-30 CN CN201510856589.XA patent/CN105350008B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426956A (en) * | 2006-04-25 | 2009-05-06 | 株式会社东乡制作所 | Anticorrosive metal part and process for producing the same |
| CN102409350A (en) * | 2010-09-26 | 2012-04-11 | 陈邱生 | Dephosphorizing equipment |
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| Publication number | Publication date |
|---|---|
| CN105350008A (en) | 2016-02-24 |
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Address after: 315821 No. 98, Jiangnan Middle Road, Beilun District, Ningbo City, Zhejiang Province Patentee after: Ningbo Minda Automobile Technology Co.,Ltd. Address before: 315821 No. 98, Jiangnan Middle Road, Beilun District, Ningbo City, Zhejiang Province Patentee before: NINGBO ZHENHAI MINDA ELECTROMECHANICAL CO.,LTD. |
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